package com.zx.base.config;

import at.pollux.thymeleaf.shiro.dialect.ShiroDialect;
import cn.hutool.crypto.digest.MD5;
import com.zx.base.shiro.MyShiroRealm;
import com.zx.pojo.Right;
import com.zx.service.RightService;
import com.zx.service.UserServiceImpl;
import org.apache.shiro.authc.credential.HashedCredentialsMatcher;
import org.apache.shiro.mgt.SecurityManager;
import org.apache.shiro.spring.security.interceptor.AuthorizationAttributeSourceAdvisor;
import org.apache.shiro.spring.web.ShiroFilterFactoryBean;
import org.apache.shiro.web.mgt.DefaultWebSecurityManager;
import org.apache.shiro.web.session.mgt.DefaultWebSessionManager;
import org.crazycake.shiro.RedisCacheManager;
import org.crazycake.shiro.RedisManager;
import org.crazycake.shiro.RedisSessionDAO;
import org.springframework.aop.framework.autoproxy.DefaultAdvisorAutoProxyCreator;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import javax.annotation.Resource;
import java.nio.charset.StandardCharsets;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;

@Configuration
public class ShiroConfig {

    // 注入 Redis 参数，从 application.yml 获得
    @Value("${spring.redis.host}")
    private String host;
    @Value("${spring.redis.port}")
    private int port;
    @Value("${spring.redis.password}")
    private String password;
    @Value("${spring.redis.connect-timeout}")
    private int timeout;

    @Resource
    private RightService rightService;

    @Bean
    public MyShiroRealm myShiroRealm() { //自定义 Realm
        MyShiroRealm shiroRealm = new MyShiroRealm();
        // 设置凭证(密码)匹配器
        shiroRealm.setCredentialsMatcher(hashedCredentialsMatcher());
        //设置启用缓存，并设置缓存名称
        shiroRealm.setCachingEnabled(true);
        shiroRealm.setAuthorizationCachingEnabled(true);
        shiroRealm.setAuthorizationCacheName("authorizationCache");
        return shiroRealm;
    }

    @Bean
    public SecurityManager securityManager() { //安全管理器 SecurityManager
        DefaultWebSecurityManager securityManager = new DefaultWebSecurityManager();
        // 注入 Realm
        securityManager.setRealm(myShiroRealm());
        // 注入缓存管理器
        securityManager.setCacheManager(cacheManager());
        // 注入会话管理器
        securityManager.setSessionManager(sessionManager());
        return securityManager;
    }

    /**
     * 密码匹配规则设置
     */
    @Bean
    public HashedCredentialsMatcher hashedCredentialsMatcher() {
        HashedCredentialsMatcher hashedCredentialsMatcher = new HashedCredentialsMatcher();
        // 使用md5算法进行加密
        hashedCredentialsMatcher.setHashAlgorithmName("md5");
        // 设置散列次数，加密几次
        hashedCredentialsMatcher.setHashIterations(2);
        return hashedCredentialsMatcher;
    }

    @Bean
    public ShiroFilterFactoryBean shiroFilterFactory(SecurityManager securityManager) {
        //Shiro 过滤器：权限验证
        ShiroFilterFactoryBean shiroFilterFactory = new ShiroFilterFactoryBean();
        //注入 SecurityManager
        shiroFilterFactory.setSecurityManager(securityManager);

        //权限验证：使用 Filter 控制资源(URL)的访问
        shiroFilterFactory.setLoginUrl("/login"); // 登录页面
        shiroFilterFactory.setSuccessUrl("/main"); // 主页
        shiroFilterFactory.setUnauthorizedUrl("/403"); // 没有权限跳转403页面

        Map<String, String> filterChainDefinitionMap = new LinkedHashMap<String, String>();//必须使用 LinkedHashMap(有序集合)
        //配置可以匿名访问的资源(URL)：静态资源
        filterChainDefinitionMap.put("/css/**", "anon");
        filterChainDefinitionMap.put("/fonts/**", "anon");
        filterChainDefinitionMap.put("/images/**", "anon");
        filterChainDefinitionMap.put("/js/**", "anon");
        filterChainDefinitionMap.put("/localcss/**", "anon");
        filterChainDefinitionMap.put("/localjs/**", "anon");

        filterChainDefinitionMap.put("/doLogin", "anon");
        filterChainDefinitionMap.put("/logout", "logout");//注销过滤器，自动注销

        //配置需要特定权限才能访问的资源(URL)
        //静态授权：包括全部需要特定权限才能访问的资源(URL)
        /*filterChainDefinitionMap.put("/user/list", "perms[用户列表]");
        filterChainDefinitionMap.put("/user/add", "perms[用户添加]");
        filterChainDefinitionMap.put("/user/edit", "perms[用户编辑]");
        filterChainDefinitionMap.put("/user/del", "perms[用户删除]");*/

        System.out.println("------ 从数据库中获得所有权限 ------");
        List<Right> rights = rightService.getAllRight(); // 获取整个系统中所有的权限信息
        for (Right right : rights) { // 动态设置受保护的每个URL的权限
            if (right.getRightUrl() != null && !right.getRightUrl().trim().equals("")) {
                filterChainDefinitionMap.put(right.getRightUrl(), "perms[" + right.getRightCode() + "]");
            }
        }

        //配置认证访问：其他资源(URL)必须认证通过才能访问
        filterChainDefinitionMap.put("/**", "authc"); // 如果没有登录，则跳转到登录页面，必须放在过滤器链的最后面

        shiroFilterFactory.setFilterChainDefinitionMap(filterChainDefinitionMap);
        return shiroFilterFactory;
    }

    @Bean(name = "shiroDialect")
    public ShiroDialect shiroDialect() {//thymeleaf 页面上使用 shiro 标签
        return new ShiroDialect();
    }

    /**
     * 开启 Shiro 注解(如@RequiresRoles,@RequiresPermissions),
     * 需借助 SpringAOP 扫描使用 Shiro 注解的类,并在必要时进行安全逻辑验证
     * 配置以下两个 bean(DefaultAdvisorAutoProxyCreator 和
     AuthorizationAttributeSourceAdvisor)
     */
    @Bean
    public DefaultAdvisorAutoProxyCreator advisorAutoProxyCreator(){
        DefaultAdvisorAutoProxyCreator advisorAutoProxyCreator = new DefaultAdvisorAutoProxyCreator();
        advisorAutoProxyCreator.setProxyTargetClass(true);
        return advisorAutoProxyCreator;
    }
    /**
     * 开启 aop 注解支持
     */
    @Bean
    public AuthorizationAttributeSourceAdvisor authorizationAttributeSourceAdvisor(
            SecurityManager securityManager) {
        AuthorizationAttributeSourceAdvisor authorizationAttributeSourceAdvisor = new AuthorizationAttributeSourceAdvisor();
        authorizationAttributeSourceAdvisor.setSecurityManager(securityManager);
        return authorizationAttributeSourceAdvisor;
    }

    /**
     * 集成Redis会话管理
     */
    public RedisManager redisManager() {
        RedisManager redisManager = new RedisManager();
        redisManager.setHost(host);
        redisManager.setPort(port);
        redisManager.setPassword(password);
        redisManager.setTimeout(timeout);
        return redisManager;
    }

    /**
     * 会话操作（缓存）
     */
    public RedisCacheManager cacheManager() {
        RedisCacheManager cacheManager = new RedisCacheManager();
        cacheManager.setRedisManager(redisManager());
        // 缓存名称
        cacheManager.setPrincipalIdFieldName("usrName");
        // 缓存有效时间
        cacheManager.setExpire(1800);
        return cacheManager;
    }

    /**
     * 会话操作（持久化）
     */
    public RedisSessionDAO redisSessionDAO() {
        RedisSessionDAO sessionDAO = new RedisSessionDAO();
        sessionDAO.setRedisManager(redisManager());
        return sessionDAO;
    }

    /**
     * 会话管理
     */
    public DefaultWebSessionManager sessionManager() {
        DefaultWebSessionManager sessionManager = new DefaultWebSessionManager();
        sessionManager.setSessionDAO(redisSessionDAO());
        return sessionManager;
    }
}
